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Department of Ophthalmic Optics, The University of Manchester Institute of Science and Technology, Manchester, U.K. Received March 25, 1982 * Ph.D. AUTHOR'S ADDRESS: W. N. Charman The Univesity of Manchester Institute of Science and Technology Department of Ophthalmic Optics P.O. Box 88, Sackville Street Manchester M60 1QD, U.K.
Charman et al. (Mon,) studied this question.